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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4d4ce46405bad066dd5f8f1f4b638ec001ae027089e2580fe42c33b7aa95dd' 
  AND token = 'nIchKsKUe7rbCsO/naWGb66Zhlfcs27xIyJi4UDRQ7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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