SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9d969d1b50da6c73b7c8b47e217dd8805b2fe41f4f824f6bbad5fa428531b1' 
  AND token = 'KrbFkzhhwTXQpcL6YTWnoMHUz3/eV289IbHRHv77flY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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