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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df1615ba52a693de38d48fc7ca5ce26ac01bb9c674607c44fed35f75a2c5bf6' 
  AND token = '71sbmaUFHOzJL7gBYAZQadJSR7n5/o6q7TxlRAiszJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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