SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6eb262663b7c34d48647b87a09818129fe4c81d9919b32a8a6e5ca3aef4fe5cd' 
  AND token = 'yghLM9T4X/7bDf8hH1bQrFj6heQqsQYnBm8tU62zj50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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