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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2744b2e6db6bc24c69aba1d8a9cc661565c9c045eb0e39c1ada38a7b5cd088cb' 
  AND token = 'drgTWxVKtYuRbd3fQWaOztJSwQKxdD6ChoaNsv8wIKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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