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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '590353fbd4eca05169e31c539414d4146cae34d6b909b655e4e048b9847a2969' 
  AND token = 'itKUKVpJCYfvjsQWGE6K3KocVBwnJkULA8A0I5bpZmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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