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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93fa394cc29d2e0f01c9217aa4246966f64341e7739d8653410b6a570c7bed8' 
  AND token = 'zicZ9BqjWHLZtDriyAS0Ul9IVxviblWmc1a3ttTbqeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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