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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63472dfd56522734ed9d024bce97ea4c10b7311912f0f92f7158ee2af37e98b8' 
  AND token = 'X6WP0WN/PUrXMxRjK+w9iurxn+ro74IPWkByFAQ4RU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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