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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f6aecdd6f8cc97e6b88ee4c3fb61e7229d317ffe5deb04e7d4c0687ada2560e' 
  AND token = 'bSKkF6HIToLXjI6v+8GAzCDsfUxsfBDeDEbkh/P4PHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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