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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d0ef34730a40b4272b4cbd03ecbacdf9c82771a02d4fb4744905a694c92ab8' 
  AND token = '0hjA/o7TWXxOb/03aS4QWUrW58xVlLXQ/0DwT4A2MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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