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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a028b795702efb2fd9418732811a75afc4e6ac1cf3ef1865926a82ace8e1ce' 
  AND token = '4HayOdOwuM8sV/lb1C4wv95cqBVTDFh8ethNjth08p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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