Rooting LG Optimus L90

I can't seem to get this phone rooted. And that's all I want, for it to be unlocked. No custom roms or anything like that(for now at least).

Is there any quick way to do this?

I'm using android 5.0.2
with kernel 3.4.0+
build number LRX22G
software version D41520c

If there's any other info you need then please ask. I'll really appreciate any help with this...

Thank you