The New 2024 Warlock: DnD 5e Class Changes | D&D Rules
To cast one of your warlock spells of 1st level or higher, you must expend a spell slot. You regain all expended spell slots when you finish a short or long rest.
Spell Slots in D&D 5e: All You Need to Know!
A Warlock’s spell slots are its biggest weakness. Up until 10th-level they only have two spell slots per short rest, and only ever get up to four spell slots at the 20th-level.
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Second, only having to sleep for 4 hours will allow casters (specifically Wizards, Sorcerers, and Warlocks) the ability to wake up before the rest of the party, cast a spell, and then Short Rest to get the spell slot back.
Resting - bg3.wiki
A Paladin X/Warlock 2 will get a couple key invocations (like the devil sight trick) and will recharge their two highest paladin spell slots on a short rest, for divine smite or for whatever other purpose.