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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bc00a96597e34d24dea6acbeb4901c702746708f6a6fba223ab17a679350223' 
  AND token = 'oJYIujRx0X/7tuogPtb3kwh6z5OVI2bbCSpmI+/wP1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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