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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f072d9c47972a80be4656e75105bbc7c63e8d3ffe2ab7e9ad79f407b3a8985cc' 
  AND token = '4+fa+CZsIfCLH7IiJcBf5Gsrcll1ZG1hU7+IoaLt3k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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