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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72c77b56c8a3660c65cf15ec9a16a462b41a74c21c46427b5d5b2899f6f2c9f4' 
  AND token = 'dc5Zl6bZW6Iie2r+dq5XtaZIFsv4ZBeXR0+sJNOjOWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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