Possible performance problem on workflow with PostgreSQL

SELECT * FROM Document WHERE ecm:mixinType = 'Task' AND ecm:currentLifeCycleState NOT IN ('ended', 'cancelled') AND ecm:isProxy = 0 AND (nt:targetDocumentId = ? OR nt:targetDocumentsIds IN (?)) AND (nt:actors IN (?) OR nt:delegatedActors IN (?))";

CREATE INDEX hierarchy_mixintypes_idx ON hierarchy USING GIN(mixintypes);