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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dca05b0d4c2a21332dcafbde8e8e0a514deeef579ca35bf19ed314aa2a7a5d7' 
  AND token = 'Cca62PLcnsKm9v130C3QF2EaxRTdu7O3UY5FINbgqlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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