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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a16f0f1203b127cff7f14291dcf5a87229faa155ea7c482d4ca6b84599ca426a' 
  AND token = 'k8a/j6Y8tO8Us8QTYk0waDS8kwsFWNjAyuteATYGH34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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