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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b13c959992434690bfb718a331890e7c9c342bc5bf086aab4515ce2d7bad38f1' 
  AND token = 'DJ5Q1eb7/Vi6pLA9lll336rnhu9mT+jrmd2G642Qx8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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