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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8918eafc88c818ec5896c56a7239a5b6310df8c62cc9373760087377532cda' 
  AND token = 'h3yqL+u1tTRYd1ew8c/mRehg/9deqQuC33IzMlLBs14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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