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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec6818871750d7d5a9efeeac7a8bf4c036c949b89c13e158a2c170e2bb86d5ac' 
  AND token = 'hysLV/tjlzmcts2InT7Wu2/ovlGZBTNa5Xv9m7Vw0LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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