SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f32b966a226f435f6001f0893c65ab8420aec581789370c427cd5bd798a5ca14' 
  AND token = 'ZoPBOwby0PY9MPYoFj/82y5x9g/ZXJE4g4C+c7aUpu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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