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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd1fd14c801bd3d843f8d6b704847250ef1ee14e1ad06afc8100c781b8cec68' 
  AND token = '/gc+A2O2HmJfoNLI23zOgmTPwbc5r8y8MkTO+gNUhkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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