How can I make OSX scan for available WiFi networks now

Here is some background:

When I'm on the move, I often have to use my mobile phone as a hotspot. Usually I will realise that after having woken up my MacBook, otherwise how would I see that no WiFi networks are available.

However, OSX does not rescan too often, I don't know the interval, but I usually end up turning off WiFi and turn it on again.

A much better solution for me would be a button / service / ... that I can nudge and that will then Search for available WiFi networks NOW

Any solutions?