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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625477d7d5841aac69c1333d9f24042dfb417c98bc0afe573c539e3ef096c2cc' 
  AND token = 'c2GW7lH0cB01ffvjSEoGUFucS1Jut/waDXCTUHnSnRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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