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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d38cfa90fb2b81b8c7e4144c6d2ea686a528ec1eea4fe9d960edb2ab15fbcff' 
  AND token = 'bZAeTqouTR41ezzY5zTctDdTcvdpum88/q781FQ7Zy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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