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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ded31225baa300629547892799e5c5c55b6ec4c5f51abe3a34ca0896da8a1ba' 
  AND token = '9j1yHNaWh5FkKRTi8CQsozIthn96WiWDBP6iFZh1W7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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