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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84c25f877e8164ef5e0c66ab1e7131846e72acc5949ba435ce548cb6fde04183' 
  AND token = '0wR4Oykv5HElM+zQry9o7akUxfdiVPYv2E+cauge9F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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