So, what is exactly these *Lightspeed Token*s?

So first of all, I didn't paid for anything. As I was looking for the requirements of unlocking Padme Amidala (wich I didn't unlocked any of them, because I hated clankers and flying cockroaches) I noticed that I can spend light speed token on them...

Is there any reason that I can do this? Where these tokens came from?

And wich is the best way to spend them?