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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa5cf2c8f0c8a4cec5887d4a3f4cbe92bcda699088d6affac972784d02ff5c0c' 
  AND token = 'CyfJ005SB7zbL5T8FwO4dwAkRxbs8EMfQF5gjYcgG2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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