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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36a20ab1b23d8b755b93166bdb67a65411776c77d10714fe70bdf572c86fbf29' 
  AND token = 'eGgIiKPg+updX0DaXz6P5mg74HUskyMiVXe4f0jemHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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