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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6f99d551f6ea73422a19f986346dca3bb64840712ae0b6cae4f4e27793bdce' 
  AND token = 'oTtFqtxZ5BeziYKeZnoDWRH6g3duXPE5FwaEUoamop4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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