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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd34ab4f77f7f5dbbec185b978b081477cc6ebe700898f00749ed740b56c8feb8' 
  AND token = 'WjX89sQlzI/1PLPGSW05Pr7V3jLjhs8Iz+e+21vpYH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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