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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd7c4c87e755113cfebdbc72c551aa2c1333ca64a121401536facf882071905' 
  AND token = '075RGVA+eEZnqGoAZ+Y62+OUQPIoeZfJcw3I5FaRD5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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