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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7fba9a6675e376491eadd8a80dda7835d5c6fb40b2b52e6c20440cd6c54facd' 
  AND token = 'OoxujiaFpb7/FwWb2SqPOXv2f1kh7SJE1WA01EMiN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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