Although it is mentioned in link below that the follow constraints work for LiveQuery, it doesn't.
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whereLessThan, whereGreaterThan, whereLessThanOrEqualTo, whereGreaterThanOrEqualTo
parseQuery.whereLessThan("key", value);
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2 equalTo constraints on 2 different keys
query.whereEqualTo("keyA", parseObject1);
query.whereEqualTo("keyB", parseObject2);
Link: https://github.com/parse-community/parse-server/wiki/Parse-LiveQuery-Protocol-Specification#subscribe-message