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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478326e5973f1a115971037798c485e89c7d9b9e88ebfe891b532b4168b21019' 
  AND token = '8wqoxuZuQZunS+ERAPVQDqA/yVTdTcQbrCe755BpNCM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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