Mysqld.exe cpu spikes (no replies)

I run a few game servers which are connected to a mysql server running in workbench and every 1 - 5 minutes mysqld.exe will spike to 6 - 10% and inturn cause lag spikes onto the game servers.

So my questions are

How would I see what queries are causing these spikes?
How would I be able to fix them or optimize it so it won't cause the servers to lag?


Thanks