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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26d43d5716c54f1c98ea7668c4fb804896b8994799a9344d40bded4cff930ca' 
  AND token = 'UTDZcT6bvMITvViNBsefu5uls+FxrWBKWqerlMJ6ki8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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