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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '286681c7fe5334922ef18b569fa729fc5c34f7c50d6089210f245932b976c37b' 
  AND token = 'C97M4JStiIVfQT/Br7VUUBMqv1xU7ViG4AD8xxlV5q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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