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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f664c02687a4293bc7ad083a88f14f9fd75dfe41b606cae937aadda2bd74e5' 
  AND token = 'f2K6m6xp+xMen4dDoii6HoRpIiYV4NaghOPhg2NFx1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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