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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07c41dd5ad15e8b5374a5423c88fe7a45e2e096ae906e935912184cce6f329ef' 
  AND token = '6MQfBq1GhU//wd0YzTDjePik9TEbNK93DwHzCdYVr5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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