there is no such things as a secure lock.
By locking the thing you are really only deterring casual thieves. Someone who happens by it and just takes that opportunity to grab a stand. For that, virtually any chain and lock that can’t be twisted apart by hand or broken with a rock will work.
People who are setting out to steal stands will more likely be carrying lock picks/rakes/shims than bolt cutters. The latter are lighter, easier to conceal, just as quick if not quicker, and a lot less conspicuous to use. Trying to find a lock that can resist an attack like that is a waste of resources.
A guy can spend $10 on a rake and 15 minutes practicing while watching a YouTube video, and be able to open a literally bulletproof Abloy padlock in 10 seconds.
