I recently had this 6:20 OSL-CDG flight - waking up at the airport hotel 4:45 and entering the airport just over 5 am was perfectly fine. But I did online check in, had no luggage to check, and due to status had a fast lane for security - and ended up having ample of time in the lounge. The normal lane did not look terrible though, I guess 20 min at most. I think if you are 1 hour to 1.15 before departure at some counter things should work. Add another 15 min for peace of mind.