SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5de095eef0d2303174623baf534c1ea0b72dd9e6cb1dfa79f211ed3bae53dc38' 
  AND token = 'CCiVzlY8Njg5GCXrpydohYpK/R9GTxhZ0NYByU4EHmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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