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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5bef17b05197da6c183cc05b1c9c58bd56c68c80e90533d24dd7a30b041c40' 
  AND token = 'gQSAO3g5kKgN102rR17iQTRU23H/oqqHwe5AAtfIcOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}