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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c33eb036e53caf6cbbfdc18515b388466628ff59f8a1fa77d321e0d7766f01a8' 
  AND token = 'rfBPgoY/evc0ysJ99BFWLnU71jtnvDpgepLpsSVZxBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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