SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13183e9846dd9f7cf9b231d3653107e01972901a454bc5bd45577a1875f82f21' 
  AND token = 'MlGdQzzeVahDZuYBHMIMl8JLPwdjvtw1wC3AtuyZgNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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