SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0585d66483f9ec764821df73e082660b8f1c8c47aeb5e2cf76d17912956d0390' 
  AND token = 'zQCPH42gFMIClKk9gmxvodQLZEs/CtZWNI5HwTUKlXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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