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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502a23bcf3136030ab0aeb6bc1543d282bc93bb3d152d5419384be6e7833488d' 
  AND token = 'Y+tG0usLazWqaGuGkDKutApo5nXOesvXhG0wciM+g58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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