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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f67581ff4124d19db3e0eb96b2c8ac388151e003b33b2b14817f047ed7e33ba' 
  AND token = 'AKcHC4Xe+RFK7+Zey+ciqoOrau+lmUGdmdfbUC3SUmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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