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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ed50ec12c641d1be3da99fbcc97e1efe0e5e1fb71c14c44b7a5cbd93f0a5010' 
  AND token = 'bZjDXycWrWID5gtJ558UtmDDqsMS0/QvFQlulWaeBQ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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