Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5143a3e6751adb2ff8f6d1d94c51cf084ce90cebe808e4b60aef877f39bad98' 
  AND token = 'uMwE+2yOSe3j08casdRt4AcfM9LMp44VatKP/Jye78I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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