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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e4b0e5654a30740a2b3a19a3ad959cba26eea79e5b950eadbcf7b9500fc293c' 
  AND token = 'nKClLdiXb/Gk1cR9xMM4YYkfyG31PFs6KotTxeyi9DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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