SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6acb09d971f7e844c6d2a86f33686f3f1c9c8992144bc8bd330743a9ec4180' 
  AND token = 'oVLfXzvXSAzgUFxG3tScrH/FBxt6RhVhgRgkDdDZf5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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