OK, I have been searching for this song for years. It's such a rare song that I would go as far as to say it's impossible to find.
However, after finding songs from the Rama O Rama and Ek Main Aur Ek Tu soundtracks here, I am hopeful that someone might have it.
I don't know the movie's name, but the song goes something like this:
"Aankhon ne padhli aankhon ki bhaasha, maane koi na maane.
Aaj bane hum janmon ke saathi, kal tak the begaane.
Humko kisi ki koi khabbar na, hum to hue deewane."
I don't know if those are the exact lyrics or not, because the last time I heard the song was probably in 1994? Haha.
The movie has Asif Sheikh in it as the hero and some unknown girl.
The song is an Udit Narayan & Kavita Krishnamurti duet. I think it released somewhere in the early 90s?