SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e697622b12a470d7cfe283d30f29dcc181c2ab6d2067e3551fbf9608589a294f' 
  AND token = 'mFgXKwV6tVZshijBqfBimG1/r9N2lF8KVr0L0pXzgaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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