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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ab336ccb343efd3c939ef059f4797dc28e8e1c21613ad73fc46437477dbb90' 
  AND token = '5arHEEXYU8sCZiaFnWvymI9UBwy3neZmbFLAN8/kymo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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