SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdba01226852932d13dbf5e9bf7a0d4ae0f6e91cfcd41a7883bb76cf874719d' 
  AND token = 'K/PUByMPxMkHhtuLeU4LBByi1oNI7Yhwp7WRwmuzj+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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