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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23a00002767c61c44bd6956ab9aadf24f1827065191e7e8c53b1f9cf209027f9' 
  AND token = 'WaR/wuYCe0Uya9d8Kd56QYQEv06nITvOsRy8QXVrKe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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