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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116fa95a2e3eede670ddec4dc33fcaa240ece43e9791582a87b48cf9937a3231' 
  AND token = '885oL8LSYaVBfSPjKCfVqqc+jjwM+YtLU2xNomX/Nes=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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