keyword1.info will rank higher for term KEYWORD1 , then a keyword1KEYWORD2.com ?! If no special optimization done?!
I wouldnt look at URL too much to optimize for searches. If you can get keyword1.info and people search for keyword1 then thats great. But no one is searching for keyword1keyword2 with no spaces. URL does not have to have keywords in it. Just look at all the authority sites for subjects do they have keywords in them? Amazon eBay Alexa Bestbuy Yahoo Google DigitalPoint ect... Try to think of some that have them in there. You should focus on branding your site name instead of putting keywords in it.