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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9193caa42dfbfd49f27c7dd298482fdb5be5de6cda81c85bb143c860ea62340a' 
  AND token = '5lLAukIQPjgyy7kJcNxbgW8lFlV2yfi65qEdqQTRi/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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