SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d1732808836ea00e22e3c267bf9a0489df78a95918b467f54a16325b5e7ed97' 
  AND token = 'GnwL2gfh2DeHSVumWWC0k+ZW7rKsMIxPloHVXFv6ox4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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