SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfb5bd75cfe979f3b02d3ef52ba3f321ae61e421b3b8d448ab98cad27f4d2fc' 
  AND token = 'SNJ22WPMGZ70fHKHotBWCYr5wYJVQUF1ZIUFX6CDH+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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