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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7f5ee7d1d238edac3d2aeda06dc46d99cea36c3199c5153966c8cb1bad41a8' 
  AND token = 'ej/woCLaV70oY4Z3i5gaGC/OOXOEjnfHwU72j5rq8FA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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