SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ab9fd8f13d89506f1ae0cbe38df1970ec5d3a793b608d2d2ad1863bce1f34c' 
  AND token = 'iWVO4ZLq6RXqw4BICQSLCKko1F4izGjzU4dxYIPnfl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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