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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52774d3e515a74d298117e5779a40b1d2e1f7a232adbd13fdbbad4c9bf43173a' 
  AND token = 'zuPYIZ/KARzYmLj0lPr2Qhqry4o2z7Q7w8yJMlVfKmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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