keylock without activating screensaver

Hi @all

is there a possibility to activate key lock without activating screensaver.

My daughter is always pressing the keys while I'm working. Sometimes she is happy if she only can press them and I would be happy if she could do it without deleting something while I could read my paper or something else...

systeminformations: OS X 10.8.5

macbook pro 2011

thank you

:-)