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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a51d1282afc86ca123b5e2aa22816d933cd76a3b66fa5b53fdccb6e97c26cbb' 
  AND token = 'gw3j5k/REr9GR9lT0/DuDALau99AeJEp7zd3aXErnrk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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