What is “mindfulness” in Islam?

That refers to being in the moment and clearing one’s mind from thinking about the past or the future. In Islam the best way to pray (perform salah) is to practice mindfulness while doing it. I like to focus on my soul while I pray, which immediately makes me focus on God’s much greater presence, and in that way I can focus on the prayer and enjoy it without getting distracted. I guess you can call that mindfulness.