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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29efd9f951c795e3eee168f3d3540232dea7bb07fa09a31f07b74387cccad5dd' 
  AND token = '92/6A6hOaPCxUsZeD8CZ7O+z8wFc8EQHGX35qoGd8gw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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