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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b17ffe085308d32b4394244c28d33e2ca626c4a25d64df9129f37be9aee6c2fe' 
  AND token = 'UPUDMZI7cHGD4DzU7J07K88aIv52nIiPnATc7hX1v4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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