SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195b83c874971a940760b2dc2d45d7f3f566bea309c13d0a50595f22f31ee67c' 
  AND token = 'VI3qZJ6aCmOmzIA/0yuYPl2CPUDlJwYB5DHLIdXRm7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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