Can a broken camshaft seized the engine?
I have a honda civic 2002 1.6L, the engine is totally seized, it won't even spin by external force (i tried to spin the pulley connected to the crankshaft, by a wrench) 1200k/m since the oil has been changed,
oil pump also working fine, no smoke at all.
COULD IT BE A BROKEN CRANKSHAFT
Disconect the drive belts and remove the spark plugs, then try and turn it over by hand, if engine refuses to turn then your looking at a recon engine or replace-ment. 
You have not said when the engine locked up: Was it locked up while running or the car has been parked for a long time? Was it related to the recently flood and the vehicle was submerged in high water? Or was it locked up because of oil starvation or mechanical failures?
This article will show you how: Freeing a stuck engine.
http://www.crankshaftcoalition.com/wiki/Freeing_a_stuck_engine
I've seen so many things that could locked up tight on any engine, not just Honda. When an engine seized up as tight as you have explained: Get a used engine or a rebuild engine. Do not waste you time and replace the engine as soon as possible as you'll need the car to drive.
Once the engine locked up, the damaged is done. The locked up engine has to be returned for core exchange, if not: A fee is already charged when you buy the rebuilt engine (Most likely).
Maybe. Some engines are what is known as an interference engine, meaning the valves in full open position extend lower than the top of the piston at top dead center. If the valves don't close in time, the piston will hit them. The camshaft is what opens and closes the valves, so if it breaks, the valves on one or more cylinders may be stuck open, and get hit by the pistons.
However, a broken timing belt is a far more common occurrence than a broken camshaft, and will have the same result.
Unfortunately, the only way to know for sure why your engine has seized is to open it up and take a look. You can pull the valve cover and visually inspect the camshaft to see if it's damaged.
More likely than a broken crankshaft, a piston likely seized (welded to the cylinder). Regardless, a seized engine is a very very expensive and serious problem.
When the timing belt breaks or jumps time a few teeth the valves will hit the pistons and lock the motor up. You will at least need a valve job and timing belt components replaced. I have seen 2 Honda's that had camshafts break or seize up. You need to pull the valve cover and timing belt cover so that you can diagnose what happened. It's a 2002. You should consider if you want to spend $1,200 to $2,500 on a vehicle that old or look for a new ride!
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