Please help me identify two pin locking connector
That connector family is called the Mate-n-Lok series. They are great power connectors and have been around for years. They come in two general sizes, the Mini type and the standard or Universal series. 

Here is a link to the Mouser catalogue page for the Mini. 

Your two pin is hard to tell from the picture if it is the universal or the mini.

This is the one you are probably after: