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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76b926ab956c0661764b448d9f165bfdc2fd78768e8e7495631523c2463536f0' 
  AND token = 'NRxCpgUw7q62Zy3MH/a0Dkvp67kAse6kwfJ7abasx+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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