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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '517238263e5b78ad74d54298112f74f9704ad86c9056b19c10fcaafd581ddb57' 
  AND token = '05m57A2C1E6g0dMQFZxRhYi37PVa8MiPE+gJ4c02670=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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