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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923eb50db5fe24b3bbb4f7b9291c6d8522c8af0aeeaf91e8bd17438a59b2a7b3' 
  AND token = 'Zcb20/GrTFgrdHLMT0NUB4emY2G0FjRO1b5WeXCy6sU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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