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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb25952133f397ae3ce3ac6b58d5550e269ff6962e264ca36c7dff4b5c966009' 
  AND token = 'liYpTj5tucYNhAJMU/d4k6duiwd/DpOVanZLqVtEF/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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