How to know whether my Xperia Ray's bootloader is locked or unlocked one

Title says all, but again a bit background I would like to know whether the bootloader on my xperia ray is locked or unlocked one. I bought it from ebay & with seller warranty (or you can say no warranty). It was a great deal & I didn't need warranty too as I was going to root it. I haven't done anything to unlock my boot loader till now. Used x-parts (auto CWM installer) to test some roms. How do I know the phone I received, has bootloader locked or unlocked?