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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8bc1330c223415ad5406c3c018cd09368e9937808040cb6f475f0ae6d95d87' 
  AND token = 'uDqh3mfZtg1oYneTJLFFHnOtE7WMaorf+IYKEGN8lpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00091

JSON explain

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