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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900357403bdb76bd309bc5a13db68a3d61d2cd9256f64bc722c977ebe9acc1bd' 
  AND token = 'fgXk2CijtnSx5o9Qzy19Ti0I6mYJkZTLzdxU47sPVdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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