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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ef45934c7cc8f5a8e99e7533e67e33445d1fccf5e39645d439550125010ab5' 
  AND token = 'ErTBa5jREdKM5FwKs+5iKquqCZn3T97Qx5bVpE6rCto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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