Database
[{_id:"1",myMap:{"44d2b0f0-1737-4beb-88aa-a02a041c6dc1":{},"dcbb1469-3ca0-4547-b7d1-296ba2f0a01d":{}}},{_id:"2",myMap:{"63f62530-89b1-439e-bcb3-2c7ab614ecda":{}}}]
Query
db.collection.aggregate([{"$addFields":{keysOfMap:{"$map":{"input":{"$objectToArray":"$myMap"},"as":"item","in":"$$item.k"}},}},{"$addFields":{"difference":{"$setDifference":["$keysOfMap",["63f62530-89b1-439e-bcb3-2c7ab614ecda","dcbb1469-3ca0-4547-b7d1-296ba2f0a01d"]]}}},{"$match":{difference:[]}},{"$project":{_id:1}}])