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If you're using Laravel, there's a package that you can use to achieve the same effect: https://github.com/hammerstonedev/fast-paginate
In both Django and Rails, passing a QuerySet or ActiveRecord::Relation as an argument to a filter/where creates a subquery - in this case, https://github.com/planetscale/fast_page/blob/main/lib/fast_... creates SELECT ... WHERE id IN (SELECT id FROM ...).
So it's not exactly an inner join, but in theory it will be optimized to the same query plan as an inner join. That said, https://stackoverflow.com/questions/2577174/join-vs-sub-quer... has lots of commentary on why this shouldn't be depended on.